See the minutes of #mer-meeting: SailfishOS, open source, collaboration: 25-November @ 15:00 UTC, specially item "4 Generic info about Jolla Tablet - SK_work or Armadillo (20 min) (cybette, 15:20:25)" in full logs :
15:23:18 <Stskeeps> tbr: i'm currently crafting a blog post where i hope we'll find a good solution together balancing privacy, security, etc. UEFI is a bag of cats. but aim is ability to install alternative OS'es on it.